Thread: Build Log SU25K Frogfoot
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Old Jun 08, 2010, 06:00 PM
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I used to fix DC9's years ago when I worked for Air Canada. there is a hydraulic jack on the whole tailplane assembly, but it is for trim function only and is held on with one bolt. the whole assembly is allowed to free float by use of dampers and bearings, within the range of capture. the elevator tabs are driven hydraulically to increase aerodynamic pressure on the whole tailplane assembly, which changes the pitch attitude of the plane. there are two aerodynamic trim tabs the further increase the mechanical advantage of the elevators and also for flight trim. I figured the Frog's operated the same way, since they are such huge surfaces and would require a lot of hydraulic pressure to operate the system.
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